AKG D12E by John Eppstein
This vintage microphone is one of the three all time great dynamic cardioid kick drum mics. You've probably seen pictures of this mic in use by most of the classic English hard rock and "traditional" metal bands of the '60s, '70s, and '80s and many others as well. But it's not a one trick pony - it works well on all electric instruments and there are even pictures of Paul McCartney singing into one. The mic is notable in that it actually has a retensionable diaphragm, unlike nearly all other dynamic mics ever made.
The mic was produced in several forms - the original D12 with pigtail cable and swivel mount, the newer D12E with integral XLR, the D20 with swivel, integral Tuchel connector (can be converted to XLR) and 3 position bass rolloff switch, and the D25 with integral shock mount around the main body of the mic. All have the same basic cartridge and head. The mic was also OEMmed to other companies, including Echolette.
I own four of these mics and they find frequent use on electric guitars, in addition to the expected kick,floor tom, and electric bass cabs.
Do not confuse this with the current D112 - despite the similarity in names they are in no way even similar in performance.
The mic is a bit delicate for such a bulky dynamic - take care when purchasing.
One of the all time classics
EDIT: in his review below, gregovertone states that once it goes it can not be revived. this is not entirely true. If the problem the mic exhibits is voice coil rub/misalignment, the fact that this mic actually has a retensionable/realignable diaphragm means that as long as the magnet is not shifted and the diaphragm is not seriously damaged it can often be repaired by retensioning the diaphragm. This is a delicate operation probably best left to an experienced tech (who does similar work on condenser mics), but it can work. I've done it.